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CallbackVstParamChangedSet method

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Sets the function of the CallbackVstParamChanged callback delegate which notifies when a parameter of the VST has been changed through its own editor


For further details about callback delegates see the How to synchronize the container application with the API tutorial.

For further details about managing a VST effect refer to the How to manage VST effects section.

For further details about methods related to the use of special effects refer to the EffectsMan class.





[Visual Basic]

Public Function CallbackVstParamChangedSet (

function as CallbackVstParamChanged

) as enumErrorCodes



public enumErrorCodes CallbackVstParamChangedSet (

CallbackVstParamChanged function




public: enumErrorCodes CallbackVstParamChangedSet (

CallbackVstParamChanged function









Callback function



when using the API from Unmanaged C++ through COM interaction, where the client application is totally unaware about .NET delegates, you should use the "Ptr" version of the method which allows passing the pointer to the callback function:


[Unmanaged C++]

enumErrorCodes CallbackVstParamChangedSetPtr (

(UINT_PTR) functionPointer








Pointer to the callback function.

See the Adding the API to an unmanaged Visual C++ project tutorial for details about usage of the "Ptr" version of these methods.



Return value






Negative value

An error occurred. Check the LastError property value in order to see the last error.

enumErrorCodes.ERR_NOERROR (0)

The method call was successful.